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		The package <tt>xxl.core.collections.queues</tt> provides miscellaneous
		implementations of the queue datastructure. It contains a bounded queue
		({@link xxl.core.collections.queues.BoundedQueue}),
		queues using inserting strategies like LIFO (
		{@link xxl.core.collections.queues.StackQueue}) and FIFO (
		{@link xxl.core.collections.queues.ListQueue}), 
		queues using special data structures for internal storing (for instance
		{@link xxl.core.collections.queues.ArrayQueue}), heaps (
		{@link xxl.core.collections.queues.Heap}) and even a threadsafe queue (
		{@link xxl.core.collections.queues.ThreadsafeQueue}).
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